dynamic_cava_colors

#!/bin/bash

file="$(mpc --format %file% current)"
i=0
[[ -z "$file" ]] && exit 1
album_dir="${file%/*}"
LIBRARY="$MUSIC/library"
cover="$LIBRARY/$album_dir/cover.jpg"

config="$DOTFILES/cava/config"
num="$1"
[[ -z "$num" ]] && num=4

export MAGICK_OCL_DEVICE=OFF
colors="$($BIN/get_colors.py $num $cover)"
if [[ -z "$colors" ]]; then
    colors='#000000
#888888'
    num=2
fi
perl -pi -e 's/^gradient_count = \d+$/gradient_count = '$num'/' -- "$config"

i=1
j=1
while grep --silent "gradient_color_$i = '$color'" "$config"; do
    ((i++))
    ((j++))
    continue
done

modified=0
for color in $(echo "$colors"); do
    if grep --silent "gradient_color_$i" "$config"; then
        perl -pi -e "s/^gradient_color_$i = '#[0-9A-Fa-f]+'$/gradient_color_$i = '$color'/" "$config"
        ((j++))
    else
        echo "gradient_color_$i = '$color'" >> $config
    fi
    modified=1
    ((i++))
done

# delete any gradient colors we didn't overwrite
if ((j == i)); then
    while grep --silent "gradient_color_$j" "$config"; do
        sed -i "/^gradient_color_$j =/d" "$config"
        ((j++))
    done
fi

((modified == 1)) && pkill -USR2 cava